It has been quite a while since the world has been made to know that the U.S. supports ISIS, and the recent attacks against the Syrian army (including pinpoint attacks that resulted in the deaths of a Russian General and two other high-ranking officers as reported elsewhere) is just the most recent provocation, as explained in this article.
http://www.fort-russ.com/2017/10/us-support-for-isis-is-biggest-obstacle.html
